# Physics 12th

## Physics Class-12 Chapter-12 Atoms Most VVI Objective Questions

Q.1. Which series comes in visible region of hydrogen spectrum ? (A) Lyman series (B) Blamer series (C) Paschen series (D) Brackett series Ans:- (B) Q.2. The minimum angular momentum of electron in hydrogen atom will be (A) h/π Js (B) nh/2π Js (C) hπ Js (D) 2πh Js Ans:- (B) Q.3. The number of …

## Physics Class-12 Chapter-11 Radiation And Dual Nature Of Matter Most VVI Objective Questions

Q.1. Which of the following has the dimensions of planck’s constant ? (A) force Time (B) force distance (C) force speed (D) force distance time Ans:- (D) Q.2. The energy (E) of photon is (A) hv (B) hv/c (C) 1/2mv (D) h/p Ans:- (A) Q.3. The SI unit of planck’s constant is (A) Js (B) …

## Physics Class-12 Chapter-15 Communication system Most VVI Objective Questions

Q.1. The optical fibre works on the principle of  (A) Scattering (B) Refraction (C) Dispersion (D) Total internal reflection Ans:- (D)  Q.2. The value of amplitude modulation index is  (A) always zero (B) between 1 and ∞ (C) between 0 and 1 (D) always ∞ Ans:- (C)  Q.3. Which frequency range is used for TV …

## Physics Class-12 Chapter-5 Magnetism and Matter Most VVI Subjective Questions

Q.1. Write three properties of magnetic field lines ? Ans:- (i) The magnetic field line originate from the north pole of a magnet and end at its south pole. (ii) The strength of magnetic field is indicated by the degree of closeness of the field lines. (iii) They form closed continuous curves. Q.2. Magnetic field lines form closed …

## Physics Class-12 Chapter-6 Electromagnetic Induction Most VVI Important Questions

Q.1. Lenz’s law is associated with  (A) charge (B) mass (C) energy (D) principle of conservation of momentum Ans:- (C) Q.2. The working of dynamo is based on the principle of  (A) heating effect of current (B) electromagnetic induction (C) magnetic induction (D)  Electric induction Ans:- (B) Q.3. Unit of self induction is  (A) weber …

## Physics Class 12th Chapter-5 Magnetism And Matter Most VVI Objective Questions

Q.1. permanent magnets are made (A) aluminium (B) soft iron (C) copper (D) Steel Answer:- (D)

## Physics Class 12th Chapter-4 Moving Charge And Magnetism Most VVI Subjective Questions

Q.1. What type of magnetic field is produced due to a current carrying straight conductor? Answer:-The magnetic field lines due to a current carrying straight condutor are the concentric circular loops lying in a plane perpendicular to the straight conductor with their centre on the conductor. Q.2. What is the S.I. unit of permeability? Also …

## Physics Class 12th Chapter-4 Moving Charge And Magnetism Most VVI Objective Questions

Q.1. Biot- Savart law indicates that the  moving electrons (velocity v) produce a magnetic field (B) such that (a) B⊥V (b) B || V (C) it obeys inverse cube law (d) it is along the line joining the electron and point of observation. Ans: (a) Q.2. A Current loop placed in a non uniform magnetic …

## Physics Class 12th Chapter-3 Current Electricity Most VVI Subjective Questions

Achiever BSEB Q.1. Write down two characteristics of fuse wire.  Ans- (1) High conductivity. (2) Low melting point. Q.2. Why is internal resistance of a secondary cell low ? Ans- The secondary cell with provide higher value of maximum current so the value of internal resistance of secondary cell is lower than primary cell. Q.3. …

## Physics Class-12th Chapter-2 “Electrostatics Potential And Capacitance” Most VVI Subjective Questions

Q.1. What is potential difference ? Ans:- It is defined as the work done in moving a unit test charge from one point to another in the electric field. Q.2. Define equipotential surface ? Ans:- It is defined as the surface at which electric potential is same at all points.  Q.3. Define capacitance. Write S.I. …